Efficiency of upconversion process in lanthanide-doped host lattices
Kunakovskaya, Ekaterina (2019)
Diplomityö
2019
School of Engineering Science, Laskennallinen tekniikka
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2019052917785
https://urn.fi/URN:NBN:fi-fe2019052917785
Tiivistelmä
The main target of this work was to investigate the influence of the host matrix on the upconversion luminescence. The quantum yield was used as a measure of luminescence efficiency. For this, a reliable and sensitive measurement setup was built and calibrated.
The upconversion luminescence efficiency was examined in upconversion nanoparticles, phosphate glasses doped by upconversion nanoparticles and rare-earth dopants, and the rare-earth-doped tellurite glasses.
It was experimentally demonstrated that besides phonon energy of the host material other parameters also play a crucial role in the luminescence efficiency such as surface and water quenching effects, material homogeneity, dopants composition and concentration, and down-conversion as a competitive process.
The upconversion luminescence efficiency was examined in upconversion nanoparticles, phosphate glasses doped by upconversion nanoparticles and rare-earth dopants, and the rare-earth-doped tellurite glasses.
It was experimentally demonstrated that besides phonon energy of the host material other parameters also play a crucial role in the luminescence efficiency such as surface and water quenching effects, material homogeneity, dopants composition and concentration, and down-conversion as a competitive process.